Improvement in rubber shoes



H. CAN HEL D.

L. L HYATT 8L l.

Rubber Shoes.`

Parenied July 15, 181s.

Witnesses.

Inventur: /y I Amirn ys.

UNITED STATES PATENT CFEICE.

LEWIS L. HYATT AND JARED H. GANFIELD, OF NEW BRUN SWIGK, N. J.

lMPROVEMENT IN RUBBER SHOES.

Specification forming part of Letters Patent No. 140,829, dated July 15, 1873; application filed Y April 5, 1873.

To all' lwhom it may concern:

Be it knownthat we, LEWIS L. HYATT and JAEED H. CANEIELD, of New Brunswick, in the county 0f Middlesex and State of New Jersey, have invented a new and useful Improvement in Rubber Shoes, of which the following is a specication:

Our invention consists of India-rubber boots and shoes, the uppers oiwhich are made considerably thicker and stronger at the junction with the sole, and a suitable distance above, than at the top and in the upper portions, and gradually lessening in thickness from the bot- -tom upward, whereby we have much more durable shoes than those heretofore made in which the uppers have always been of uniform thickness from the bottom to'top, and have been made too light and thin for the requisite strength in the bottom portions, in order not to have them too thick and clumsy in the upper portions, so that they often burst and tear along the junction with the sole, or a little above, Where the strain is much greater than it is in the upper portions, owing to being stretched over the angle of the inner shoe thereat, and to the powerful strains occasioned thereat by the lateral pressure and movements of the feet when treading on uneven ground, stones, &c. In carrying out the invention, we sink the dies in the rolls, by which the sheets for the upper portions of the shoes are made deeper in the parts in which the lower portions of the uppers are formed than in the parts whereon the upper portions are formed, and thus we produce the required variations in the thickness at the same time that we make the sheets, which we make with rolls in the ordinary way.

-Figure l is a side elevation of a rubber shoe, constructed according to our invention, with a small portion cut out to show a section of the upper near the heel. Fig. 2 is a crosssection of the shoe taken on the line x .fc ofl Fig. l. Fig. 3 is a front elevation of rolls for making the sheets for the uppers of rubber shoes. Fig. 4 is a cross-section of Fig. 3 on the line y y.

A represents the upper and B the sole of an India-rubber shoe, which are inall respects like ordinary rubber shoes, except in the matter of the thickness of the upper, which, it will be seen by the sections in Figs. l and 2, are thicker in the lower parts a than in the parts b, so that while we have the requisite strength for durability along the lower portions where the wear and strain are greatest, we have the requisite lightness in the upper parts, to avoid the clumsy and unshapely appearance that they would have if, in order to have the requisite strength in the lower parts, they were made sufficiently thick thereat in the common way of making them--that is, making the uppers of uniform thickness throughout.

In Figs. 3 and 4 we have represented dierollers, such as are used for making the up` pers'of rubber shoes, to show the modifications in the dies we make in order to make the uppers according to our improvement. The said modications consist in deepening the dies in the parts in which the portions to be thickened are made, as shown at d, which parts are deeper than the parts e are for the upper portions of the upper.

Having thus described our invention, we claim as new and desire toV secure by Letters Patent- Y A one-piece rubber upper made thick at a a and thin at b, as and for the purpose described.

LEWIS L. HYATT. JARED H. CANFIELD..

Witnesses:

A. M. WAY,

E. S. HYATT. 

